I'm used to holding the left Alt and entering the ASCII character whenever I'm using an unknown keyboard configuration and want to type a special character.
For example, Alt + 0 + 9 + 2 makes a backslash (\).
That's on Windows. Is there a way to do this in Ubuntu?
Note: I also want to be able to use this in console mode. That means I don't want a solution involving software with a GUI.